Université de Fribourg

A comparative study of (poly)ether adducts of alkaline earth iodides – an overview including new compounds

Maudez, William ; Fromm, Katharina M.

In: Zeitschrift für anorganische und allgemeine Chemie, 2012, vol. 638, no. 11, p. 1810–1819

New homoligand and mixed-ligand adducts of the heavier alkaline earth metal (Ca, Sr, Ba) halides with oxygen-donor polyether ligands have been isolated and characterized and are compared with previously obtained compounds of the same class in order to give an overview on structures and properties. Homoligand halide adducts, discussed herein, are [CaI(DME)₃]I (1),...

Université de Fribourg

Tautocrowns: a concept for a sensing molecule with an active side-arm

Antonov, Liudmil M. ; Kurteva, Vanya B. ; Simeonov, Svilen P. ; Deneva, Vera V. ; Crochet, Aurelien ; Fromm, Katharina M.

In: Tetrahedron, 2010, vol. 66, no. 24, p. 4292-4297

A new sensing molecule containing aza-15-crown-5 as a receptor and 4-(phenyldiazenyl)naphthalen-1-ol as a signal converter has been synthesized. In the free ligand, the hydrogen bonding between the tautomeric OH group and the nitrogen atom from the macrocycle fully shifts the tautomeric equilibrium towards the enol form. The complexation reverses the equilibrium as a result of the strong...